can I use a hyphen in the phrase .... 'strongly linked to stressful life-events within the previous month.' ?
Yes, I would use a hyphen there. It makes it clear that you mean "stressful [life events]" and not "[stressful life] events".
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Yes, I would use a hyphen there. It makes it clear that you mean "stressful [life events]" and not "[stressful life] events".